CN107145261B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN107145261B CN107145261B CN201710522314.1A CN201710522314A CN107145261B CN 107145261 B CN107145261 B CN 107145261B CN 201710522314 A CN201710522314 A CN 201710522314A CN 107145261 B CN107145261 B CN 107145261B
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- pressure sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
Abstract
The embodiment of the invention discloses a display panel and a display device, wherein the display panel comprises a substrate base plate, a display area and a non-display area surrounding the display area; at least one pressure sensing unit located in the non-display area, the pressure sensing unit including an input end and an output end; the input line is electrically connected with the input end of the pressure sensing unit, and the output line is electrically connected with the output end of the pressure sensing unit; in a direction perpendicular to the substrate base plate, there is an overlap of at least two of all the input lines and the output lines extending in the same direction. The technical scheme provided by the embodiment of the invention can reduce the frame width of the display panel occupied by the input line and the output line, and realize the narrow frame design of the display panel.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel and a display device.
Background
At present, a display panel with a touch function is widely applied to various display products such as mobile phones, tablet computers, information query machines in public halls and the like as an information input tool.
In order to better satisfy the user requirement, a pressure sensing unit for detecting the magnitude of touch pressure when a user touches the touch display panel is generally arranged in the touch display panel, so that the pressure sensing unit not only can collect touch position information, but also can collect the magnitude of touch pressure, and the application range of the touch display technology is expanded. The pressure sensing unit is generally implemented by a bridge, and the pressure sensing unit needs to input an offset signal at an input end thereof and output a pressure detection signal at an output end thereof according to the input offset signal. The metal wiring electrically connected with the input end and the output end of the pressure sensing unit occupies a small frame area.
Disclosure of Invention
The invention provides a display panel and a display device, which aim to reduce the frame area occupied by the input line and the output line of a pressure sensing unit of the conventional display panel and realize the narrow frame design of the display panel.
In a first aspect, an embodiment of the present invention provides a display panel, including:
a substrate including a display area and a non-display area surrounding the display area;
at least one pressure sensing unit located in the non-display area, the pressure sensing unit including an input end and an output end;
the input line is electrically connected with the input end of the pressure sensing unit, and the output line is electrically connected with the output end of the pressure sensing unit; in a direction perpendicular to the substrate base plate, there is an overlap of at least two of all the input lines and the output lines extending in the same direction.
In a second aspect, embodiments of the present invention provide a display device, which includes the display panel provided in any of the embodiments of the present invention.
According to the technical scheme provided by the embodiment of the invention, on the basis of realizing the pressure detection of the display panel through the pressure sensing unit, at least two of all the input lines and output lines extending in the same direction of the pressure sensing unit are overlapped, so that the width of the display panel occupied by the input lines and the output lines can be reduced, and the narrow-frame design of the display panel is realized.
Drawings
FIG. 1 is a schematic diagram of a display panel according to the prior art;
fig. 2A is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2B is a schematic structural diagram of another display panel according to an embodiment of the invention;
fig. 3A is a schematic structural diagram of another display panel according to an embodiment of the invention;
fig. 3B is a circuit diagram of a pressure sensing unit according to an embodiment of the present invention;
fig. 4A is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 4B is a schematic structural diagram of another display panel according to an embodiment of the invention;
fig. 4C is a schematic structural diagram of another display panel according to an embodiment of the invention;
fig. 4D is a circuit diagram of a pressure sensing unit according to an embodiment of the present invention;
fig. 4E is a schematic structural diagram of another pressure sensing unit according to an embodiment of the present invention;
FIG. 4F is an equivalent circuit diagram of another pressure sensing unit according to an embodiment of the present invention;
fig. 5A is a schematic structural diagram of another display panel according to an embodiment of the invention;
FIG. 5B is a timing diagram of a scan signal according to an embodiment of the present invention
Fig. 5C is a schematic structural diagram of another display panel according to an embodiment of the invention;
FIG. 5D is a schematic cross-sectional view taken along a-a in FIG. 5C;
FIG. 5E is a schematic cross-sectional view taken along the line b-b in FIG. 5C;
FIG. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a display panel in the prior art. Referring to fig. 1, the display panel includes a substrate 100, including a display region 200 and a non-display region 300, and further including a pressure sensing unit 400 located in the non-display region 300, and an input line 500 and an output line 600 electrically connected to the pressure sensing unit 400, where the input line 500 and the output line 600 are arranged in the non-display region 300, that is, arranged in a frame region, the input line 500 and the output line 600 occupy a portion of the frame region of the display panel, as shown in fig. 1, in a same direction, for example, in a Y direction in the drawing, between the input line 500 and the output line 600, between the input line 500 and the input line 500, there is no overlap between the output line 600 and the output line 600, and a frame width of the display panel occupied by the input line 500 and the output line.
Fig. 2A is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 2A, the display panel 10 includes:
a substrate 11 including a display area 110 and a non-display area 120 surrounding the display area;
at least one pressure sensing unit 12 positioned in the non-display area 120, the pressure sensing unit 12 including an input terminal a and an output terminal B;
an input line 13 electrically connected to an input terminal a of the pressure sensing unit 12, and an output line 14 electrically connected to an output terminal B of the pressure sensing unit 12; in the direction perpendicular to the substrate base plate 11, there is an overlap of at least two of all the input lines 13 and the output lines 14 extending in the same direction.
In the embodiment of the present invention, the overlapping of one input line 13 and one output line 14 means that the perpendicular projection of the input line 13 on the array substrate 11 and the perpendicular projection of the output line 14 on the array substrate 11 at least partially coincide in the same direction. The overlapping input and output lines may be located at different film layers of the display panel. It can be seen that in the case where the widths of the traces (input lines or output lines) are not changed and the pitches between the traces are not changed, in the display panel shown in fig. 2A, there is an overlap between two input lines 13 and two output lines 14, the input line 12 and the output line 13 occupy a bezel width d2 of the display panel, and d2 is smaller than d1 in fig. 1. It can be seen that, due to the overlap, the input lines 13 and the output lines 14 occupy a reduced width of the non-display region 120 of the display panel 10 in the X direction, i.e., a reduced width of the occupied bezel, which facilitates a narrow bezel design of the display panel.
The display panel 10 in fig. 2A exemplarily shows two pressure sensing units 13, and in other embodiments of the embodiment of the present invention, the display panel 10 may also include one or more than two pressure sensing units 12. Referring to fig. 2B, fig. 2B is a schematic structural diagram of another display panel according to an embodiment of the present invention. The display panel 10 of fig. 2B is provided with a pressure sensing unit 12, and the input line 13 and the output line 14 of the pressure sensing unit 12 overlap. In addition, in fig. 2A, the input line 13 of the first pressure sensing cell 12 overlaps the input line 13 of the second pressure sensing cell 12, and the output line 14 of the first pressure sensing cell 12 overlaps the output line 14 of the second pressure sensing cell 12. In other embodiments of the present invention, the input line 13 of one pressure sensing cell 12 may overlap the output line 14 of another pressure sensing cell 12, and the output line 14 of one pressure sensing cell 12 may overlap the input line 13 of another pressure sensing cell 12.
Optionally, fig. 3A is a schematic structural diagram of another display panel provided in an embodiment of the present invention. Referring to fig. 3A, on the basis of the above embodiment, the input terminals of the pressure sensing unit 12 include a first input terminal a1 and a second input terminal a2, and the output terminal of the pressure sensing unit 12 includes a first output terminal B1, that is, the pressure sensing unit 12 may be provided with two input terminals and one output terminal. Wherein the first input terminal a1 and the second input terminal a2 are used for inputting bias signals, such as direct current voltage signals; the first output end B1 is used for outputting a pressure sensing signal, and the output pressure sensing signal can reflect the magnitude of the external pressure value. The magnitude of the external pressure value (the pressure value generated by pressing the display panel with the finger) can be determined according to the pressure sensing detection signal output by the first output end B1 of the pressure sensing unit 12, so as to realize the detection of the external pressure. For example, the first output end B1 of the pressure sensing unit 12 is connected to a processor on the display panel, and the processor receives the pressure sensing signal output by the first output end B1 of the pressure sensing unit 12 and determines the magnitude of the external pressure according to the pressure sensing signal.
The input line comprises a first connecting conductor 101 and a second connecting conductor 102, the output line comprises a third connecting conductor 103; the first connecting wire 101, the second connecting wire 102 and the third connecting wire 103 are electrically connected to the first input terminal a1, the second input terminal a2 and the first output terminal B1, respectively.
At least two of all the first connecting wires 101, the second connecting wires 102 and the third connecting wires 103 extending in the same direction are overlapped in a direction perpendicular to the substrate base plate 11, for example, the first connecting wires 101 and the third connecting wires 103 are overlapped in the Y direction.
Optionally, fig. 3B is a circuit diagram of a pressure sensing unit according to an embodiment of the present invention, referring to fig. 3B, wherein the pressure sensing unit may include a first sensing resistor R1 and a second sensing resistor R2; a first end of the first sensing resistor R1 is electrically connected to the first input end a1 of the pressure sensing unit 12, a second end of the first sensing resistor R1 and a first end of the second sensing resistor R2 are electrically connected to the first output end B1 of the pressure sensing unit 12, and a second end of the second sensing resistor R2 is electrically connected to the second input end a2 of the pressure sensing unit 12. Under the same external pressure, the change rate or the main strain direction of the first sensing resistor R1 and the second sensing resistor R2 is different, for example, when the external pressure is applied, the resistance of the first sensing resistor R1 increases, the resistance of the second sensing resistor R2 decreases, the signal output by the first output end B1 of the pressure sensing unit 12 changes, and the magnitude of the external pressure can be determined by measuring the pressure sensing signal output by the first output end B1 of the pressure sensing unit 12.
Fig. 4A is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 4A, on the basis of the above embodiment, the input terminals of the pressure sensing unit 12 include a first input terminal a1 and a second input terminal a2, and the output terminals of the pressure sensing unit 12 include a first output terminal B1 and a second output terminal B2. That is, the pressure sensing unit 12 may be provided with two input terminals and two output terminals. Accordingly, each pressure sensing unit 12 may be provided with two input lines and two output lines, that is, the input lines may include the first connecting wire 101 and the second connecting wire 102, and the output lines may include the third connecting wire 103 and the fourth connecting wire 104; wherein the first connecting wire 101, the second connecting wire 102, the third connecting wire 103 and the fourth connecting wire 104 are electrically connected with the first input end a1, the second input end a2, the first output end B1 and the second output end B2, respectively; at least two of all the first connecting conductive lines 101, the second connecting conductive lines 102, the third connecting conductive lines 103 and the fourth connecting conductive lines 104 extending in the same direction are overlapped in a direction perpendicular to the substrate base plate 11, for example, one pressure-sensitive cell 12 is exemplarily shown in fig. 4A, and the third connecting conductive lines 103 and the fourth connecting conductive lines 104 electrically connected to the pressure-sensitive cell 12 are overlapped in the Y direction.
Fig. 4B is a schematic structural diagram of another display panel according to an embodiment of the present invention. With respect to the display panel shown in fig. 4A, the display panel 10 exemplarily shows that two pressure sensing cells, i.e., a first pressure sensing cell 121 and a second pressure sensing cell 122, overlap, a third connection wire 103 electrically connected to the first pressure sensing cell 121 and a third connection wire 103 electrically connected to the second pressure sensing cell 122 overlap, and a portion of a wire extending in the Y direction of the two third connection wires 103 overlaps. The fourth connection wire 104 to which the first pressure sensing cell 121 is electrically connected and the fourth connection wire 104 to which the second pressure sensing cell 122 is electrically connected overlap, and wires extending in the Y direction of the two fourth connection wires 104 completely overlap.
Fig. 4C is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 4C, the display panel exemplarily shows four pressure sensing units 12, wherein two pressure sensing units are located at one side of the non-display area 120, and the other two pressure sensing units 12 are located at the other side of the non-display area 120. The first connecting wire 101, the second connecting wire 102, the third connecting wire 103 and the fourth connecting wire 104 electrically connected to the pressure sensing cell 12 are located at the same side of the non-display area as the pressure sensing cell 12. For the two pressure sensing cells 12 at the left side of the non-display area 120, the electrically connected third connection conductive line 103 of the first pressure sensing cell 12 and the electrically connected third connection conductive line 103 of the second pressure sensing cell 12 overlap, and the electrically connected fourth connection conductive line 104 of the first pressure sensing cell 12 and the electrically connected fourth connection conductive line 104 of the second pressure sensing cell 12 overlap. Two pressure sensing cells 12 corresponding to the right side of the non-display area of the display panel shown in fig. 4C, wherein the second connecting conductive line 102 electrically connected to the first pressure sensing cell 12 and the third connecting conductive line 103 electrically connected to the second pressure sensing cell 12 overlap, and the fourth connecting conductive line 104 electrically connected to the first pressure sensing cell 12 and the fourth connecting conductive line 104 electrically connected to the second pressure sensing cell 12 overlap.
It should be noted that, in general, at least two of the input lines and the output lines on the same side of the non-display region 120 overlap, and the input lines and the output lines on different sides of the non-display region do not overlap, for example, corresponding to the display panel shown in fig. 4C, the input lines and the output lines on the left side of the non-display region 120 do not overlap with the input lines and the output lines on the right side of the non-display region 120.
Optionally, fig. 4D is a circuit diagram of another pressure sensing unit provided in the embodiment of the present invention. Referring to fig. 4D, the pressure sensing unit 12 includes a third sensing resistor R3, a fourth sensing resistor R4, a fifth sensing resistor R5, and a sixth sensing resistor R6. A first end of the third sensing resistor R3 and a first end of the fifth sensing resistor R5 are electrically connected to the first input end a1 of the pressure sensing unit 12, a second end of the third sensing resistor R3 and a first end of the fourth sensing resistor R4 are electrically connected to the first output end B1 of the pressure sensing unit 12, a second end of the fifth sensing resistor R5 and a first end of the sixth sensing resistor R6 are electrically connected to the second output end B2 of the pressure sensing unit 12, and a second end of the fourth sensing resistor R4 and a second end of the sixth sensing resistor R6 are electrically connected to the second input end a2 of the pressure sensing unit 12.
The resistance change rates or the main strain directions of the third sensing resistor R3 and the sixth sensing resistor R6 are the same, the resistance change rates or the main strain directions of the fourth sensing resistor R4 and the fifth sensing resistor R5 are the same, and the resistance change rates or the main strain directions of the third sensing resistor R3 and the fourth sensing resistor R4 are different. In this way, when the external pressure acts, the first output end B1 and the second output end B2 of the pressure sensing unit 12 will output different electrical signals, and the magnitude of the external pressure value can be determined based on the electrical signals output by the first output end B1 and the second output end B2, for example, the magnitude of the external pressure value is determined according to the difference between the output signals of the first output end B1 and the second output end B2.
Optionally, fig. 4E is a schematic structural diagram of another pressure sensing unit provided in the embodiment of the present invention. Referring to fig. 4E, the pressure sensing unit 12 is a quadrilateral, made of a semiconductor material, and includes a first side and a second side that are opposite to each other, and a third side and a fourth side that are opposite to each other; the first input terminal a1, the second input terminal a2, the first output terminal B1 and the second output terminal B2 of the pressure sensing unit 12 are located at the first side, the second side, the third side and the fourth side, respectively. As shown in fig. 4F, the equivalent circuit diagram of the pressure sensing unit 12 is that two adjacent connection terminals (the first input terminal a1 and the first output terminal B1, the first input terminal a1 and the second output terminal B2, the second input terminal a2 and the first output terminal B1, and the second input terminal a2 and the second output terminal B2) are connected through a semiconductor material film, which is equivalent to being connected through a resistor R, and at this time, four resistors R are obtained by equivalence between the four connection terminals, which is equivalent to a bridge shown in fig. 4D, and the specific principle of detecting pressure can refer to the description of the operation of the pressure sensing unit shown in fig. 4D. Wherein, the shape of the pressure sensing unit can be square.
Further, based on the above embodiments, the first input terminals of the pressure sensing units located on the same side of the non-display area may be electrically connected to the same first connecting wire, and/or the second input terminals may be electrically connected to the same second connecting wire. For example, referring to fig. 5A, fig. 5A is a schematic structural diagram of another display panel provided in the embodiment of the present invention. The display panel 10 is exemplarily provided with two pressure sensing units, i.e., a first pressure sensing unit 121 and a second pressure sensing unit 122, which are located on the same side of the non-display area 120. The first input terminal a1 of the first pressure sensing unit 121 and the first input terminal a1 of the second pressure sensing unit 122 are electrically connected to the same first connecting wire 101, and the second input terminal a2 of the first pressure sensing unit 121 and the second input terminal a2 of the second pressure sensing unit 122 are electrically connected to the same second connecting wire 102. In other words, the first pressure-sensing unit 121 and the second pressure-sensing unit 122 share the first connection wire 101 and the second connection wire 102; the first pressure sensing unit 121 and the second pressure sensing unit 122 may share only the first connection wire 101 or only the second connection wire 102. Therefore, the number of the first connecting wires 101 and the second connecting wires 102 can be reduced, the width of the frame of the display panel occupied by the first connecting wires 101 and/or the second connecting wires 102 is saved, and the narrow frame of the display panel is realized.
In the case of sharing the first connection wire and/or sharing the second connection wire, at least one of the third connection wire and the fourth connection wire electrically connecting the same pressure-sensitive cell overlaps at least one of the third connection wire and the fourth connection wire electrically connecting another pressure-sensitive cell on the same side of the non-display area 120 in a direction perpendicular to the substrate base plate 11. Illustratively, with continued reference to fig. 5A, the third connecting wire 103 electrically connected to the first output terminal B1 of the first pressure sensing cell 121 overlaps the third connecting wire 103 electrically connected to the first output terminal B1 of the second pressure sensing cell 122, and the fourth connecting wire 104 electrically connected to the second output terminal B2 of the first pressure sensing cell 121 overlaps the fourth connecting wire 104 electrically connected to the second output terminal B2 of the second pressure sensing cell 122.
In an embodiment of the present invention, the non-display area 120 may include a plurality of stages of shift registers, an output end of each stage of shift register is electrically connected to a scan line, the scan line is configured to transmit an output scan signal of the shift register to the pixels, the pixels in the display area are turned on row by row, and the pixels can perform light emitting display based on the display data signal after being turned on. The two input terminals of the pressure sensing unit 12 may be electrically connected to the output terminals of the shift registers of different stages, the scan signal output by the output terminal of the shift register is provided as a bias signal to the first input terminal a1 and the second input terminal a2 of the pressure sensing unit, the first output terminal B1 and the second output terminal B2 of the pressure sensing unit 12 are used for outputting a pressure sensing detection signal, and the output pressure sensing detection signal may reflect the magnitude of an external pressure value. For example, the first input terminal a1 of each pressure sensing unit located on the same side of the non-display area 120 is electrically connected to the output terminal of one stage of shift register, and the second input terminal a2 is electrically connected to the output terminal of another stage of shift register.
The following describes a process of operating using the scanning signal outputted from the shift register as a bias signal in the form of fig. 4D as the pressure sensing unit. FIG. 5B is a timing diagram of scan signals, wherein SS1 represents the scan signal outputted from the output terminal of one stage of shift register, i.e. the signal inputted from the first input terminal A1 of the pressure sensing unit 12, and SS2 represents the scan signal outputted from the output terminal of another stage of shift register, i.e. the signal inputted from the second input terminal A2 of the pressure sensing unit 12. SS1 and SS2 each include a low stage and a high stage, the low stage outputting a low voltage of vgl and the high stage outputting a high voltage of vgh. Assuming that the voltage input between the first input terminal a1 and the second input terminal a2 of the pressure sensing unit 12 is Uin, the resistances of the third sensing resistor R3, the fourth sensing resistor R4, the fifth sensing resistor R5 and the sixth sensing resistor R6 are R3, R4, R5 and R6, respectively, and the voltage output from the first output terminal B1 is Uout, the voltage output from the first output terminal B1 is Uout
Referring to fig. 4D and 5B, when not pressed, the resistances of the third, fourth, fifth, and sixth sense resistors R3, R4, R5, and R6 are not changed. At the stage t1, the pressure sensing unit 12 has a first input terminal a1 for inputting a low level signal (voltage value vgl) and a second input terminal a2 for inputting a high level signal (voltage value vgh). Then, in this phase, i.e. the first line scanning phase, the voltage outputted from the first output terminal B1 of the pressure sensing unit 12
The voltage output by the second output terminal B2 of the pressure sensing unit 12
When r 3-r 4-r 5-r 6-r, the following formula (i) is added
That is, the pressure difference between the first output terminal B1 and the second output terminal B2 of the pressure sensing unit 12 is zero. At stage t2, the first stage of the pressure sensing unit 12The differential pressure between the one output terminal B1 and the second output terminal B2 is also zero.
When the pressure is applied, the resistance value of the third sensing resistor R3 is increased by deltar, and the resistance value of the sixth sensing resistor R6 is increased by deltar; the resistance of the fourth sense resistor R4 is decreased by Δ R and the resistance of the fifth sense resistor R5 is decreased by Δ R. Then, during the period t1, the voltage outputted from the first output terminal B1 of the pressure sensing unit 12
The voltage output by the second output terminal B2 of the pressure sensing unit 12
The voltage difference between the first output terminal B1 and the second output terminal B2 is
The magnitude of the external pressure value can be determined according to the voltage difference between the first output end B1 and the second output end B2.
The magnitude of the pressure value may also be determined from the sweep signal at stage t 2. With continued reference to fig. 4D and fig. 5B, during the period t2, the first input terminal a1 of the pressure sensing unit 12 inputs a high level signal (with a voltage value of vgh), and the second input terminal a2 inputs a low level signal (with a voltage value of vgl).
Then, at this stage, i.e. during the second line scan, the voltage outputted from the first output terminal B1 of the pressure sensing unit 12
Voltage output from the second output terminal B2
The voltage difference between the first output terminal B1 and the second output terminal B2 of the pressure sensing unit 12 is
In the embodiment of the present invention, the magnitude of the pressure may also be determined according to the difference between the first output terminal B1 and the second output terminal B2 during two-line scanning, for example
It can be seen that the difference between the first output terminal B1 and the second output terminal B2 is larger during two-line scanning under the same external pressure, so that the sensitivity of the pressure sensing unit 12 is higher, the testing accuracy can be improved, and the error can be reduced.
FIG. 5C is a schematic structural diagram of another display panel according to an embodiment of the present invention, FIG. 5D is a schematic sectional diagram taken along a-a direction in FIG. 5C, and FIG. 5E is a schematic sectional diagram taken along b-b direction in FIG. 5C; referring to fig. 5C, 5D and 5E, on the basis of the above embodiment, the pressure sensing units located on the same side of the non-display area 120 include a first pressure sensing unit 121, a second pressure sensing unit 122 and a third pressure sensing unit 123.
The third connecting wire 103 and the fourth connecting wire 104 electrically connected to the first pressure sensing unit 121 are located in the first metal layer 161, the third connecting wire 103 and the fourth connecting wire 104 electrically connected to the second pressure sensing unit 122 are located in the second metal layer 162, and the third connecting wire 103 and the fourth connecting wire 104 electrically connected to the third pressure sensing unit 123 are located in the third metal layer 163.
The third connection conductive line 103 electrically connected to the first pressure sensing unit 121, the third connection conductive line 103 electrically connected to the second pressure sensing unit 122, and the third connection conductive line 103 electrically connected to the third pressure sensing unit 123 overlap.
The fourth connection wire 104 electrically connected to the first pressure sensing unit 121, the fourth connection wire 104 electrically connected to the second pressure sensing unit 122, and the fourth connection wire 104 electrically connected to the third pressure sensing unit 123 overlap.
The first metal layer 161 and the second metal layer 162, the second metal layer 162 and the third metal layer 163, and the first metal layer 161 and the third metal layer 163 are isolated by insulating layers, for example, the first insulating layer 171 and the second insulating layer 172. It should be noted that fig. 5D and 5E only exemplarily show the first insulating layer 171 and the second insulating layer 172, and other film layers may be further disposed between the first metal layer 161 and the second metal layer 162, and between the second metal layer 162 and the third metal layer 163.
On the basis that the first pressure sensing unit 121, the second pressure sensing unit 122 and the third pressure sensing unit 123 share the first connecting wire 101 and the second connecting wire 102, the third connecting wire 103 and the fourth connecting wire 103 of the first pressure sensing unit 121, the second pressure sensing unit 122 and the third pressure sensing unit 123 are located on different metal layers and are overlapped, so that the width of the frame of the display panel occupied by the first connecting wire 101, the second connecting wire 102, the third connecting wire 103 and the fourth connecting wire 104 can be reduced to the maximum extent, and the narrow frame of the display panel is realized.
The display panel provided by the embodiment of the invention can also comprise a scanning line for transmitting a scanning signal, a data line for transmitting a data signal, a touch signal line for transmitting a touch signal and a storage capacitor for storing the data signal; the first metal layer, the second metal layer and the third metal layer are located on different layers, and one of the first metal layer, the second metal layer and the third metal layer and one of the scanning lines, the data lines, the touch signal lines and the electrodes of the storage capacitors are located on the same layer. Therefore, the number of the film layers on the display panel can be reduced, the display panel is easy to thin, and the first metal layer, the second metal layer and the third metal layer, namely the third connecting wire and the fourth connecting wire of the pressure sensing unit, can be formed simultaneously when the scanning lines, the data lines, the touch signal lines and the electrodes of the storage capacitor are formed, so that the process steps are saved.
Preferably, in the embodiment of the present invention, the first connection wire 101 and the second connection wire 102 of the pressure sensing unit 12 are disposed on the same layer as the data line, and since it is necessary to provide the bias signal to the pressure sensing unit 12 through the first connection wire 101 and the second connection wire 102, and in order to prevent the bias signal from having smaller loss and delay, the impedances of the first connection wire 101 and the second connection wire 102 are generally required to be small, and the impedance of the data line on the display panel is generally smaller, the first connection wire 101 and the second connection wire 102 can be disposed on the same layer as the data line, and can be formed by using the same material in the same process step, thereby saving process steps.
Fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 6, two pressure sensing units, i.e., a first pressure sensing unit 121 and a second pressure sensing unit 122, are exemplarily disposed in the display panel 10 and are located on the same side of the non-display area 120. The first output terminal B1 of the first pressure sensing unit 121 and the first output terminal B1 of the second pressure sensing unit 122 are electrically connected to the same third connecting wire 103, and the second output terminal B2 of the first pressure sensing unit 121 and the second output terminal B2 of the second pressure sensing unit 122 are electrically connected to the same second connecting wire 102. In other words, the first pressure sensing cells 121 and the second pressure sensing cells 122 share one third connection wire 103 and one fourth connection wire 104. In this manner, the number of the third connecting wires 103 and the fourth connecting wires 104 can be reduced. It is also possible to share only one third connecting lead 103 or only one fourth connecting lead 102. And further, the first connecting wires 101 and/or the second connecting wires 102 are saved from occupying the width of the frame of the display panel, so that the narrow frame of the display panel is realized.
In the case of sharing the third connection wire and/or sharing the fourth connection wire, at least one of the first connection wire and the second connection wire electrically connecting the same pressure-sensitive cell overlaps at least one of the first connection wire and the second connection wire electrically connecting another pressure-sensitive cell on the same side of the non-display area in a direction perpendicular to the substrate base plate. Illustratively, with continued reference to fig. 6, the first connecting wire 101 electrically connected to the first input terminal a1 of the first pressure sensing cell 121 overlaps the first connecting wire 101 electrically connected to the first input terminal a1 of the second pressure sensing cell 122, and the second connecting wire 102 electrically connected to the second input terminal a2 of the first pressure sensing cell 121 overlaps the second connecting wire 102 electrically connected to the second input terminal a2 of the second pressure sensing cell 122.
In the embodiment of the present invention, the input terminal a of the pressure sensing unit 12 inputs an offset signal, for example, the first input terminal a1 and the second input terminal a2 input offset signals, and the output terminal B of the pressure sensing unit 12 outputs a pressure sensing signal, for example, the first output terminal B1 and the second output terminal B2 cooperate to output a pressure sensing signal; the frequency of the bias signal input by the input end a of the pressure sensing unit 12 is less than or equal to 1kHz, the input signal is a low-frequency signal, and when the low-frequency signal is input by the input end a of the pressure sensing unit 12, at least two of the input line 13 and the output line 14 overlap, for example, at least two of the first connecting lead 101, the second connecting lead 102, the third connecting lead 103 and the fourth connecting lead 104 overlap. The influence of the overlapping capacitance between the wires (input wires or output wires) and the wires on signals transmitted on the wires is small, the normal work of the pressure sensing unit 12 is not influenced, the width of the frame of the display panel occupied by the wires can be reduced on the premise that the external pressure is reliably detected, and the narrow frame design of the display panel is realized.
The embodiment of the invention also provides a display device. Fig. 7 is a schematic diagram of a display device according to an embodiment of the present invention. Referring to fig. 7, the display device 70 includes the display panel 10 according to any embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (15)
1. A display panel, comprising:
a substrate including a display area and a non-display area surrounding the display area;
at least one pressure sensing unit located in the non-display area, the pressure sensing unit including an input end and an output end;
the input line is electrically connected with the input end of the pressure sensing unit, and the output line is electrically connected with the output end of the pressure sensing unit; at least two of the input lines and the output lines extending in the same direction along a direction perpendicular to the substrate overlap, wherein the non-display region includes a plurality of stages of shift registers, different input terminals of the pressure sensing units are electrically connected with scanning signal output terminals of the shift registers of different stages, respectively, and scanning signals output by the scanning signal output terminals of the shift registers serve as bias signals of the pressure sensing units.
2. The display panel according to claim 1, wherein the input terminal of the pressure sensing unit comprises a first input terminal and a second input terminal, and the output terminal of the pressure sensing unit comprises a first output terminal;
the input line comprises a first connecting conductor and a second connecting conductor, and the output line comprises a third connecting conductor; wherein the first connecting wire, the second connecting wire and the third connecting wire are electrically connected with the first input terminal, the second input terminal and the first output terminal, respectively;
at least two of all the first connecting wires, the second connecting wires and the third connecting wires extending in the same direction are overlapped in a direction perpendicular to the substrate base plate.
3. The display panel according to claim 1, wherein the input terminals of the pressure sensing unit include a first input terminal and a second input terminal, and the output terminals of the pressure sensing unit include a first output terminal and a second output terminal;
the input line comprises a first connecting wire and a second connecting wire, and the output line comprises a third connecting wire and a fourth connecting wire; wherein the first connecting wire, the second connecting wire, the third connecting wire and the fourth connecting wire are electrically connected with the first input terminal, the second input terminal, the first output terminal and the second output terminal, respectively;
at least two of all the first connecting wires, the second connecting wires, the third connecting wires and the fourth connecting wires extending in the same direction are overlapped in a direction perpendicular to the substrate base plate.
4. The display panel according to claim 3, wherein the first input terminals of the pressure sensing units located on the same side of the non-display area are electrically connected to the same first connecting wire, and/or the second input terminals are electrically connected to the same second connecting wire.
5. The display panel according to claim 3, wherein at least one of the third connecting conductive lines and the fourth connecting conductive lines electrically connecting the same one of the pressure-sensitive cells overlaps at least one of the third connecting conductive lines and the fourth connecting conductive lines electrically connecting another one of the pressure-sensitive cells on the same side of the non-display region in a direction perpendicular to the substrate.
6. The display panel according to claim 5, wherein the pressure sensing units located on the same side of the non-display area include a first pressure sensing unit, a second pressure sensing unit, and a third pressure sensing unit;
a third connecting wire and a fourth connecting wire which are electrically connected with the first pressure sensing unit are positioned on a first metal layer, a third connecting wire and a fourth connecting wire which are electrically connected with the second pressure sensing unit are positioned on a second metal layer, and a third connecting wire and a fourth connecting wire which are electrically connected with the third pressure sensing unit are positioned on a third metal layer;
a third connecting lead electrically connected with the first pressure sensing unit, a third connecting lead electrically connected with the second pressure sensing unit and a third connecting lead electrically connected with the third pressure sensing unit are overlapped;
and a fourth connecting lead electrically connected with the first pressure sensing unit, a fourth connecting lead electrically connected with the second pressure sensing unit and a fourth connecting lead electrically connected with the third pressure sensing unit are overlapped.
7. The display panel according to claim 6, further comprising a scan line for transmitting a scan signal, a data line for transmitting a data signal, a touch signal line for transmitting a touch signal, and a storage capacitor for storing the data signal; the first metal layer, the second metal layer and the third metal layer are located at different layers, and one of the first metal layer, the second metal layer and the third metal layer is located at the same layer as one of the scanning lines, the data lines, the touch signal lines and the electrodes of the storage capacitors.
8. The display panel according to claim 7, wherein the first connecting conductive line and the second connecting conductive line are disposed on the same layer as the data line.
9. The display panel according to claim 3, wherein the pressure sensing unit comprises a first sensing resistor, a second sensing resistor, a third sensing resistor and a fourth sensing resistor;
the first end of the first sensing resistor and the first end of the third sensing resistor are electrically connected with the first input end, the second end of the first sensing resistor and the first end of the second sensing resistor are electrically connected with the first output end, the second end of the third sensing resistor and the first end of the fourth sensing resistor are electrically connected with the second output end, and the second end of the second sensing resistor and the second end of the fourth sensing resistor are electrically connected with the second input end.
10. The display panel according to claim 3, wherein the pressure sensing unit has a quadrilateral shape, is made of a semiconductor material, and comprises a first side and a second side which are oppositely arranged, and a third side and a fourth side which are oppositely arranged;
the first input end, the second input end, the first output end and the second output end of the pressure sensing unit are respectively positioned on the first edge, the second edge, the third edge and the fourth edge.
11. The display panel according to claim 10, wherein the pressure sensing unit has a square shape.
12. The display panel according to claim 3, wherein the first output terminal of the pressure sensing unit located on the same layer of the non-display area is electrically connected to the same third connecting wire, and/or the second output terminal is electrically connected to the same fourth connecting wire.
13. The display panel according to claim 12, wherein at least one of the first connection wire and the second connection wire electrically connecting the same one of the pressure-sensitive cells overlaps at least one of the first connection wire and the second connection wire electrically connecting another one of the pressure-sensitive cells on the same side of the non-display region in a direction perpendicular to the substrate base plate.
14. The display panel according to claim 1, wherein an input terminal of the pressure sensing unit inputs a bias signal, and an output terminal of the pressure sensing unit outputs a pressure sensing detection signal; the frequency of the bias signal input by the input end of the pressure sensing unit is less than or equal to 1 kHz.
15. A display device characterized by comprising the display panel according to any one of claims 1 to 14.
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| CN107621906B (en) * | 2017-09-29 | 2020-07-21 | 厦门天马微电子有限公司 | Display panel and display device |
| CN107806959B (en) * | 2017-10-19 | 2020-06-19 | 厦门天马微电子有限公司 | Display panel, test method thereof and display device |
| CN107562284B (en) * | 2017-10-24 | 2020-10-23 | 武汉天马微电子有限公司 | Display panel and display device |
| CN107678217B (en) * | 2017-11-01 | 2020-10-23 | 武汉天马微电子有限公司 | Liquid crystal display panel and liquid crystal display device |
| CN107656169B (en) * | 2017-11-02 | 2021-03-16 | 厦门天马微电子有限公司 | Display panel, display device and detection method of display panel |
| CN110618734A (en) | 2019-08-28 | 2019-12-27 | 武汉华星光电半导体显示技术有限公司 | Display device and manufacturing method thereof |
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